text: /**
   *
   * @description running unit tests for different functions in ParkingLot class.
   *
   */
  const sh = require('shelljs');
  
  sh.exec('mocha tests/specs.js', (err, stdout, stderr) => {
      if (err) {
          console.log('Error running unit tests');
      }
      console.log('Running unit tests...');
  });